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ARLINGHAM, GLOUCESTERSHIRE - MAY 03: Catherine, Duchess of Cambridge feeds a lamb as she visits Farms for City Children on May 3, 2017 in Arlingham, Gloucestershire. Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week. (Photo by Samir Hussein/WireImage)

ARLINGHAM, GLOUCESTERSHIRE - MAY 03:  Catherine, Duchess of Cambridge feeds a lamb as she visits Farms for City Children on May 3, 2017 in Arlingham, Gloucestershire.  Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week.  (Photo by Samir Hussein/WireImage)

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ARLINGHAM, GLOUCESTERSHIRE - MAY 03: Catherine, Duchess of Cambridge strokes a lamb as she visits Farms for City Children on May 3, 2017 in Arlingham, Gloucestershire. Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week. (Photo by Samir Hussein/WireImage)

ARLINGHAM, GLOUCESTERSHIRE - MAY 03:  Catherine, Duchess of Cambridge strokes a lamb as she visits Farms for City Children on May 3, 2017 in Arlingham, Gloucestershire.  Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week.  (Photo by Samir Hussein/WireImage)

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ARLINGHAM, GLOUCESTERSHIRE - MAY 03: Catherine, Duchess of Cambridge visits Farms for City Children on May 3, 2017 in Arlingham, Gloucestershire. Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week. (Photo by Samir Hussein/WireImage)

ARLINGHAM, GLOUCESTERSHIRE - MAY 03:  Catherine, Duchess of Cambridge visits Farms for City Children on May 3, 2017 in Arlingham, Gloucestershire.  Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week.  (Photo by Samir Hussein/WireImage)

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ARLINGHAM, UNITED KINGDOM - MAY 03: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits Farms for City Children on May 3, 2017 in Arlingham, England. Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week. (Photo by Max Mumby/Indigo/Getty Images)

ARLINGHAM, UNITED KINGDOM - MAY 03: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits Farms for City Children on May 3, 2017 in Arlingham, England. Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week. (Photo by Max Mumby/Indigo/Getty Images)

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ARLINGHAM, UNITED KINGDOM - MAY 03: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits Farms for City Children on May 3, 2017 in Arlingham, England. Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week. (Photo by Max Mumby/Indigo/Getty Images)

ARLINGHAM, UNITED KINGDOM - MAY 03: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits Farms for City Children on May 3, 2017 in Arlingham, England. Farms for City Children is a charity which offers children in the UK a chance to live and work on a real farm for a week. (Photo by Max Mumby/Indigo/Getty Images)